Placeholder issue

[robiXxu]

According to the documentation the way to add a placeholder is :

     placeholders:{
       name: 'test',
     },

However, when running the task i get:

java -cp /home/robixxu/root/<project>/node_modules/grunt-flyway/flyway-3.2.1/lib/flyway-commandline-3.2.1.jar:/home/robixxu/root/<project>/node_modules/grunt-flyway/flyway-3.2.1/lib/flyway-core-3.2.1.jar org.flywaydb.commandline.Main migrate -url="jdbc:postgresql://localhost:5432/somedb" -driver="org.postgresql.Driver" -user="someuser" -password="somepassword" -locations="filesystem:db/migration" -placeholders.0="undefined"

It seems like placeholders should be an array.
I tried using ${0}in the migration file and pass:

placeholders:{
  'test'
},

It seems to work, but is not a good solution if you have many placeholders.